Article Figures & Data
Figures
- Fig 1.
Case 36. Sinonasal angiomatous polyp in a 28-year-old woman. A, Axial T1WI shows a slightly hypointense lesion in left maxillary sinus and nasal cavity. B, Axial T2WI demonstrates a well-defined lesion, which shows hyperintense signal intensity centrally with a peripheral hypointense rim (white arrows). The hyperintense signal intensity in the ipsilateral maxillary sinus indicates obstructive sinusitis. C, Axial fat-suppressed contrast-enhanced T1WI shows the marked patchy enhancement with the nonenhanced hypointense rim. D, Axial DWI shows the mass of slightly high signal intensity with a peripheral low-signal-intensity rim. E, Photomicrograph shows numerous extravasated red blood cells, fibrosis, and thin-walled vessels. Scattered hemosiderin-laden macrophages and inflammatory cells are also seen (hematoxylin-eosin, original magnification ×200).
- Fig 2.
Case 33. Sinonasal angiomatous polyp in a 29-year-old man. A, Axial T2WI demonstrates a well-defined lobulated mass in the left maxillary sinus and nasopharynx. The lesion displays high signal intensity centrally with a peripheral hypointense rim (white arrows). Obstructive sinusitis in the ipsilateral maxillary sinus is observed as well. B, Axial fat-suppressed contrast-enhanced T1WI shows marked patchy enhancement, with no enhancement of the peripheral hypointense rim.
- Fig 3.
Case 12. Sinonasal angiomatous polyp in an 11-year-old boy. A, Axial T2WI demonstrates a well-defined lesion in right maxillary sinus and nasal cavity. The lesion is seen as high signal intensity with internal hypointense septa and a peripheral hypointense rim (black arrows). Obstructive sinusitis in the ipsilateral maxillary sinus is noted as well. There is an associated inflammatory edematous nasal polyp (white arrow). B, Axial fat-suppressed contrast-enhanced T1WI shows marked patchy enhancement with a peripheral nonenhanced hypointense rim. The inflammatory nasal polyp is unenhanced (white arrow).
- Fig 4.
Case 16. Sinonasal angiomatous polyp in an 80-year-old man. A, Axial T2WI shows a well-circumscribed lesion in right maxillary sinus and nasal cavity. The lesion reveals heterogeneous signal intensity with a peripheral hypointense rim and internal hypointense septa. B, Axial fat-suppressed contrast-enhanced T1WI shows marked lobular enhancement and confluent lobular appearance. A nonenhanced peripheral hypointense rim is noted. C, Coronal DCE MR image at approximately 50, 150, and 250 seconds of different time phases demonstrates the increasing enlargement of enhancing areas, namely the progressive enhancement pattern. D, The round cursor marks the ROI selected for the description of the TIC on DCE MR imaging. E, The corresponding TIC depicts a rapidly enhancing and rapid washout pattern (type III).
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